John of Damascus

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John of Damascus, called John Damascene, was a Greek-speaking Christian monk and priest of the early eighth century whose great work gathered the inheritance of earlier Greek theology into a single ordered exposition — the synthesis that became, for the Eastern Church, the closest thing it had to a standard textbook of doctrine. He was born in Damascus around 675, under Muslim rule, into a family that held office in the Umayyad administration; tradition holds that he served the caliphate himself before withdrawing to the monastery of Mar Saba in the Judaean desert, where he was ordained and where he died, by the usual reckoning, around 749.

His best-known book is the Fount of Knowledge. Its three parts move from philosophical groundwork through a catalogue of heresies to the Exact Exposition of the Orthodox Faith, the section read and copied on its own for centuries afterward. What John attempted there was less original system than careful arrangement: he set out to say what the Greek Fathers had already taught, organized so that it could be held together and handed on. The opening part borrows the apparatus of Aristotelian logic — definitions, categories, the vocabulary of substance and accident — and turns it to the service of doctrine, an early instance of the marriage of philosophy and theology that the Latin schoolmen would later carry much further. The Exposition was translated into Latin in the twelfth century and read by Aquinas and his contemporaries; the debt runs in both directions across the later division of the churches.

He wrote in the middle of the first great controversy over images. When the Byzantine emperors moved to forbid the veneration of icons, John — living outside imperial reach, under a different sovereign — composed three Treatises on the Divine Images in their defense. His argument turned on the Incarnation: that because God had taken visible flesh, the visible could now bear the holy, and that the honor paid to an image passes to the one it depicts rather than resting on the wood and paint themselves. The Second Council of Nicaea in 787 vindicated that position after his death, and the distinction he drew became part of how the Orthodox tradition justifies its icons to this day.

His debts to earlier thought are openly carried. From the writer known as Dionysius the Areopagite he took the language of God’s unknowability and the ordered ranks of being; from Origen, Maximus, and the Cappadocians, the substance of what he transmitted. Scholarship reads him less as an innovator than as the man who closed an age — the one who stood at the end of the patristic centuries and bound their work into a form durable enough to survive them. The Eastern Church remembers him as a saint and as a maker of its liturgical hymns; the Western, having borrowed his summary, eventually named him a Doctor of the Church. He is among the last figures the two traditions can claim together without dispute.

→ Related: Pseudo Dionysius The Areopagite · Aristotle · Origen · Logos